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Table 1 - Comparison of properties of asbestos and texturized fiberglass (Zetex) Property Asbestos Zetex G Filament Zetex DE Filament Density (oz/yd 2) 40: 35: 32 Breaking Strength, lb (Warp/Fill) 160/80: 346/423: 442/428 Abrasion Testing (cycles to failure - CS10 Wheel, 500 g/wheel) 230 to 824: 493 a: 871 Thermal Properties
Ordinary A-glass ("A" for "alkali-lime") or soda lime glass, crushed and ready to be remelted, as so-called cullet glass, was the first type of glass used for fiberglass. E-glass ("E" because of initial electrical application), is alkali free, and was the first glass formulation used for continuous filament formation.
Glass fibers have been produced for centuries, but the earliest patent was awarded to the Prussian inventor Hermann Hammesfahr (1845–1914) in the U.S. in 1880. [3] [4]Mass production of glass strands was accidentally discovered in 1932 when Games Slayter, a researcher at Owens-Illinois, directed a jet of compressed air at a stream of molten glass and produced fibers.
Its bi-directional strength make glass cloth useful for some fiberglass reinforced plastics. [3] For example, the Rutan VariEze homebuilt aircraft uses a moldless glass cloth - epoxy composite structure and skin. Glass cloth is commonly used as the reinforcing lattice for pre-pregs. [4]
FR-4 is a composite material composed of woven fiberglass cloth with an epoxy resin binder that is flame resistant (self-extinguishing). "FR" stands for "flame retardant", and does not denote that the material complies with the standard UL94V-0 unless testing is performed to UL 94, Vertical Flame testing in Section 8 at a compliant lab.
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